Elotjriitg-mill



1 l. SPEIGHT.

Flour Mill.

No. 22,384. Patented Dec. 21, 1858.

UNITED STATES FATE T OFFICE.

IRA SPEIGI-IT, OF WOODVILLE, MISSISSIPPI.

FLOURING-MILL.

Specification of Letters Patent No. 22,884, dated December 21, 1858.

To all whom it may concern:

Be it known that I, IRA Srnrorrr, of \Voodville, in the county of\Vilkinson and State of Mississippi, have invented a new and usefulImprovement in Flouring-Mills; and I do hereby declare that thefollowing is a full, clear, and exact description of the same, referencebeing had to the accompanying drawings, forming a part of thisspecification, in which- Figure l is a vertical, central section of aportion of a tiouring mill having my improvement applied to it. Fig. 2is an in verted plan of the upper grinding stone. Fig. 3 is a top viewof the lower grinding stone.

Similar letters of reference in each of the several figures indicatecorrespondingparts.

My invention relates to that description of fiouring mill which has theupper stone attached to a hollow spindle, and the lower stone attachedto a solid spindle, which has the hollow spindle fitted over the solidspindle and revolved in an opposite direction to said solid spindle; andthe nature of my improvement consists in effecting the attachment of theupper stone A, to the hollow spindle B, by means of a left hand screw C;and the lower stone D, to the solid spindle E, by means of a right handscrew F; the left hand screw attachment consisting of a metal femalescrew tapped thimble Gr, fitted in the eye a, of the upper stone and aleft hand screw thread C, out on the hollow spindle, and the right handscrew attachment consisting of a metal female screw tapped thimble H,fitted in the eye I), of the lower stone.

By my invention, the stones can, by simply reversing the direction oftheir revolution, be readily removed from the spindle for the purpose ofredressing, and again replaced with equal facility, as no keys or Wedgesrequire to be withdrawn or inserted. In connection with the above, Ipropose to employ stones dressed as follows: The lower stone D, with a.fine granulated surface, and the upper stone with grinding edges 0, c,and draft furrows (Z, (Z, which strike out tangentially from the eye a,of the'stone, and take a curved direction until they meet and unite withradial grinding edges (2, e, and draft furrows f, f, leading to andterminating at the circumference of the stone. By this mode of dressingthe expense of dressing the lower stone with grinding edges and furrowsis avoided as the dress of the upper stone in combination with thefinely granulated surface is found in practice to effectually accomplishthe grinding of the flour. The wear of the upper grinding edges is alsodiminished as two approximating grinding edges do not come together inthe revolution of the stones. The grinding and discharge of the flourare also effected more uniformly and speedily as there are no lowergrinding edges and furrows for the grain to be caught by and carriedaround after it has been ground by the upper stone. And as there is butone set of draft furrows, there is no chance for unbroken grains to getbetween the upper and lower furrows and be discharged before beingground into flour.

lVhat I claim as my invention and desire to secure by Letters Patent,is-

Hanging mill stones by means of right and left screws, substantially asand for the purposes set forth.

The above specification of my improvement in fiouring mill is herebysigned by me this 14th day of October, 1858.

IRA SPEIGHT.

W'itnesses G. Yonnn AT LEE, EDw. F. BROWN.

